Advanced electronic signature
With a qualified certificate, you get an advanced electronic signature based on a qualified certificate – accepted by authorities in Czechia, for example. A commercial certificate gives an advanced electronic signature.
Digitally sign PDF with a certificate
Add a digital signature to your PDF with your own certificate from a .p12 or .pfx file. With a qualified certificate, it’s an advanced electronic signature based on a qualified certificate under the EU eIDAS regulation. The signature is created right in your browser.
- End-to-end encrypted
only you can see what’s inside - Deleted after 1 hour
from your last edit - Free, no cookies
no sign-up
Drag and drop a PDF here
or
Select PDF to signYou’ll choose your certificate once the document opens
How it works
- 1
Open your PDF
Drag the document into the window. It opens right away, and so does the signing dialog.
- 2
Choose your certificate
Select your .p12 or .pfx file and enter its password. You’ll see right away who the certificate belongs to and whether it’s qualified.
- 3
Sign and download
The signed document is downloaded. To add a visible stamp with your name, place it beforehand with Signature → Digital signature with a certificate.
What it can do
Your certificate stays with you
Neither the certificate file nor the password is sent anywhere – the signature is created in your browser.
Timestamp
A trusted timestamp is added to the signature. The timestamp authority receives only a fingerprint of the signature, never the document.
Visible signature stamp
Place a stamp with your name, date, reason and location anywhere on the page. Or sign invisibly.
Frequently asked questions
What certificate do I need?
A certificate for electronic signatures, stored together with its private key in a .p12 or .pfx file – you can export it from the Windows certificate manager, for example. Qualified certificates are issued by EU trust service providers (in Czechia, for example, PostSignum or I.CA).
Can I sign with an eID card or a USB token?
No. A web browser can’t access smart cards or tokens. To sign with them, use Adobe Acrobat Reader or your certificate issuer’s app.
Will authorities accept this signature?
With a qualified certificate, you create an advanced electronic signature based on a qualified certificate under the EU eIDAS regulation. In Czechia, that’s a “recognized electronic signature” that authorities accept (Act No. 297/2016 Coll.); elsewhere, check what the authority requires. The signature follows the European PAdES standard, and you can verify it in Adobe Acrobat Reader, for example.
Can several people sign the document?
Yes. Each additional signer opens the already signed file and adds their signature. Don’t edit the document in between, or earlier signatures would no longer be valid.
Where is my certificate sent?
Nowhere. The certificate, password and private key stay only in your browser’s memory and are discarded after signing. For the timestamp, only a fingerprint (hash) of the signature is sent via our server.
Who can see my document?
Only you and anyone you send the link to. The document is edited in your browser and only ever reaches our server encrypted. The copy deletes itself one hour after your last edit. Learn more in our privacy policy.